...that is, the azimuth of the principal plane of the prism, measured from a fixed plane in the disc ; 07 the angle •whose tangent is equal to the ratio of the axes of the ellipse described ; p the difference of retardation of the oppositely polarized pencils transmitted through the plate,...

...our figures turned round the axis of z, in a given direction, through 90°. Let the co-ordinates of, y' be measured in the principal planes whose azimuths...time, X the length of a wave, and put for shortness, ?(«*-*)=* ........................ a). Then about the time t, and at no very great distance from a...

...with the horizontal and vertical directions. The difference in the two readings for the analyser will be the angle whose tangent is equal to the ratio of the semi-diameters of the ellipse. CHAPTER XXIII PHOTOMETRY AND COLOUR VISION 154. Standards of Light....

...Let the co-ordinates x, y be measured in the principal planes whose azimuths are a, a + 90°; let ft be the angle whose tangent is equal to the ratio of...axes of the ellipse described, the numerical value of ft being supposed not to lie beyond the limits 0 and 90°; let v be the velocity of propagation, t...

...that is, the azimuth of the principal plane of the prism, measured from a fixed plane in the disc ; m the angle whose tangent is equal to the ratio of the axes of the ellipse described ; p the difference of retardation of the oppositely polarized pencils transmitted through the plate,...

...the plane of polarization to the direction to which / refers and — тг/2 íí /3 ^ + тг/2 is an angle whose tangent is equal to the ratio of the axes of the ellipse which characterizes the state of polarization. (The sign of ß depends on whether the polarization...